Pneumatic tool.



' M. B. FETCHER PNEUMATIC TOQL. APPUCAHON BED JUNE 21. 1916-.

75.42224w a QM fl 770/7771 V Patented Mar. 5,1918.

UNITED s TEs PATENT OFFICE. A

MARTIN 3. amount, or nErRoI'r, MICHIGAN, AssIenoR r -HIGH'LAND :eAnK, MIcHIGnn;

To all whom it may concern:

. I Be it'known that I, {MARTIN citizen of the United States, residing troit, county of Wayne, State of Michigan,

have invented a certain new and useful Im-; proyernent inPneum'atic Tools, and declare the following to be a "full, clear,' and exact description of the same, such as-will enable others skilled in the art to which. it per tains to inake'and use thesame; reference being had to the accompanying:drawings;

which form a part of this specification.

tc'clanip-fthe bottom' coils of the helical springs and-one channel may be used to.

' This invention relates to a pneumatic tool forjpinching together the flanges -oiia chanl; strip. .;1thas in view the clamping of flanges of a channel border'strip used 4 on afjjspring .cushion for automobile" seats. One-ofsuch borderstrips as can be advantageously. operated upon by this toolis Glow interior one lor more ports 'k connect shown-inthe patent to Leonard A. Young,

cushionlsprings are provided with oneor clamp the.- bottom edge of the upholstering V skirt fittedover the spring cushion. Heretofore thisjwork has been done by the use ofv a pair of pliers-operated'wholly by hand,

and it has been extremely slow and tire?- some work. t The tool'of this application is intendedto do the work'of the hand pliers in a much more expeditious and satisfactory way.

In the drawings,- Figure 1 is an elevation of the tool partly broken away.

atDe-f the grooves inthe position of the I ports open into the annular; chamber Z which taken on the line.

jtion. The inner end of this "Specification cfLettei siPatent. fQPatented Mar. 5, 1918. a iincaaon mama a 1, 191e. Serial no. 195,045,

if der form'edbetween the two chambers of the cylinder and at this end of the bushing periphery of the bush ing communicate with the interior of the chamber by reason of merging into the in-. teri'o'rly cut. annular groove h in the inside at the end of thebushing.-

The end of'the .bushing does not quite fill up the shoulder g andconsequently leaves a ledge a which serves as a stop for the head j of the piston, which as seen inthe drawings, is constructed of two diameters,

provided with a;

with the interior'ofthe pis' t'on. Inthe outer piston shown in Fig. 2, these is an enlargement'of the chamber at near the outer end of the cylinderg-and this annular chamber Z communicates 'With. the atmosphere throughthe ports At the inner end of the cylinder 6 the air distributing disk a is held in place by the cap n-that screws over this inner end of the cylinder as shown in Fig. 2. This air distributing disk is recessedv as at 0 on the outside, and is provided with\an'annular groove ;0 on the inside. The passage-ways '9 lead from the recess 0 to the p, and this annular groove is located over the ends of the longitudinal grooves. f of ,thebushing e. Fig. 2 is. a longitudinal section taken on,"

.the line A-A of Fig. 1.

The cap 11. is'p'rovided with anopening rextendmg from one side transversely and diametrically almost but not clear through 'valve 8 in the formof a cylinder of con 'siderably reduced diameter at its mid porcylinder is pro vided with a recess t'in which engages the hollow interior closed at its outer end. Near: the closed end of the hol- LEONARD A. YOUNG; or I one portion "to fit in substantially air-tight relation withthe'bushingi-cfand the other to fit'in sub stantially air tightrelation within the cha'mer of smaller diameter d; This piston is annular groove j coil springi'u which abuts against the end of the valve chamber andthe end of the recess inthe end of the valve. Thisspring normally tends to keep the valve projected and closed as shown by the dotted lines in Fig. 2. In this projected position the inner end of the valve covers a port '0 leading from the valve chamber to the inside of the cap and communicatin with the recess o in the distributing dis It also closes the pas-- sage-way 411 leading axially from the outer end of the cap into the valve chamber. The outer end of this passage-way 'w has a tapered thread into which screws the nipplezv connecting with the'air line 3 An extension of the outer end of the cylinder b forms a hook-like anvil 2: nicely calculated to fit around the outside of the channel. An extension of the piston forins'an impact member 1 having a grooved impact face 2 adapted torcatch. and turn over the edge of the flange as shown in Fig. 2.

The work is-shown in section in this figure.

4 3 designates a double channel strip or what is usually called an S strip now quite largely used as the border strip of an automobile seat cushion. This strip extends entirely around the bottom of the cushion. The

1 manufacturer of the springs secures the helical'springs which form the main supporting springs of the cushion to this border strip by means of pinching the inside-facin channel over the lower coils 4 of the helica springs. As already alluded to, this pinch-.

ing has universally been done heretofore by the use of apair of pliers. With my pneumatically operated tool, this operation can now be very much more rapidly done by the tool. The'spring is shipped tothe automobile manufacturer or trimmer with the outturn over the flange as shown in Fig. 2."

This showing suffices to show how the inward-facing channel can be pinched over theilower coils of the helical springs, although perhaps for this work a slightly differentlyeshaped hook on the anvil could be used to accord with the slightly. different shape-of the channel, or in practice-it might be found more convenient to hook the anvil over the outside flange of the channel and do the pinching by driving the inside flangeand the spring against the outside flange.

rocate a. great many thousand times in a minute. p

. The operation of the tool is effected by pushing in the valve .9 which brings the reduced portion of the valvein the position shown in the full lines of 'Fig'. 2, allowing the air passage-way w to communicate with the air port 1), the air passing thence into the recess '0 of the distributing disk through the passage-ways g into'the annular groove 10, whence it is distributed through the longitudinal slots f of the bushing, passing out into theannular groove h in the inner inside end of' the bushing. Here the compressed air strikes the shoulder on thepiston head and lifts the piston from the position shownin the full lines of Fig. 2 to the position shown in the dotted lines. 'When the port 70 comes above the shoulder z, the air rushes into the hollow interior of the piston, immediately arrests its inward move ment .and thrusts it outward with great force by reason of the pressure area on the inside of the piston and on the inner end greatly exceeding thepressure area on'the shoulder tending to thrust it inward. After the port is passes outward beyond the shoulder 5, the air supply-is, of course, cut off but the air continues to expand and drive the piston outward until the ports Ia reach the annular groove Z, whereupon the air behind the piston is exhausted into the atmosphere through the passage-ways m. The pressure on the shoulder on the head of the piston then immediately causes the piston to drive inwardlyagain. These operations are repeated with great rapidity so that the impact member reciprocates a great many thousandftimes' a minute.

What I claim is:' 1. A pneumatic strip, comprising a portable cylinder having an arm extended therefrom provided with a hooked portion, and a reciprocatable piston in the cylinder provided with; an impact member connected to move with the piston whereby the hooked portion may be movedlongitudinally on one side of the channel strip and the reciprocating impact member on the other side to close the channel strip.

2. The method of closing the channel strip of a seat cushion for securing upholstering in place, comprising striking the channel tool for closing channel I strip on one side a multiplicity of sharp, blows with a thrusting and retracting int-4' pact member at the relatively great speed:

attainable with a pneumatic tool, opposirji'glflfi the blows by an anvil on the opposite side pact member andyanyiltogether 1,258,20e r 8 of the strip and relatively mov inF the impneumatic tool and'sli'cling the reciprocatl nally with respect to the channel strip. posed'anvil on the opposite side of the ch'an- 3. The method of1; closing the channel nel longitudinallylrelative to the' channel. 5 strip' of-ia seat cushion tosecur'e upholster [Intestim'ony whereof, I this speci -Q 'ing in: place, --compiising'.striking' the chanfication. r nel with an impact member reciprocating at l I l I the relatively great speed attainable with '9, MARTIN B. FETCHER.

ngitudi- 1ng Impact member togetherwithan op- 

